No hotels/condos on the Dutch side allow nude swimming at their pools that I'm aware of. Your only option would be to rent a villa with pool that is private enough to accomodate private sunbathing au naturel. We found a place in Pelican Key that we'll be staying at on our upcoming trip at the end of the month called Sera Bella. I will post a trip report after we return.

The only nude snorkel trip that I'm aware of is Captain Alan's with Paul, and they are not doing any trips until later in June. Paul is the best!!! Great guy, great time, great people!